Calculations of vortex ring states and autorotation in helicopter rotor flow fields

O. Inoue, Yuji Hattori, K. Akiyama

Research output: Contribution to conferencePaper

Abstract

Unsteady flow fields, from hover to windmill brake state, of a model helicopter rotor are studied by direct numerical simulations of the three-dimensional, compressible Euler equations. "Vortex ring state" is captured for the case of a descent velocity close to the average downward velocity in hover, and the existence of a vortex ring in this state is confirmed. The aerodynamic characteristics are in good qualitative agreements with experiments. "Autorotation" is also captured for a low collective pitch angle and a large descent velocity.

Original languageEnglish
Publication statusPublished - 1997 Jan 1
Event28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States
Duration: 1997 Jun 291997 Jul 2

Other

Other28th Fluid Dynamics Conference, 1997
CountryUnited States
CitySnowmass Village
Period97/6/2997/7/2

ASJC Scopus subject areas

  • Engineering(all)

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    Inoue, O., Hattori, Y., & Akiyama, K. (1997). Calculations of vortex ring states and autorotation in helicopter rotor flow fields. Paper presented at 28th Fluid Dynamics Conference, 1997, Snowmass Village, United States.